Propeller for dishwashing machines



April 13 1926. 1,580,586

G. S. CLARKSON PROPELLER FOR DISHWASHING IACHINES Filed Sept. 25, 1923 INVBN'I'OR 6.5.Glarko0y Bur Patented Apr. 13, 1926.

:UNITED STATES PATENT O FI E;

GUY S. CLARKSON, OF WINNIPEG. MANITOBA CANADA, ASSIGNOR TO DAVID R.

FINKELSTEI N, OF WINNIPEG, MANITOBAfCAIN 'ADA.

' PBOPELLER FOR DISHWASHING MAGHli'NES.

Application filed September 25, 1923 Serial No.. 664,761.

To all whom 7ft may concern:

Be it known thatI, GUY S. CilARiisoN,

i of the city of Winnipeg, in the Provinceof Manitoba, Canada, have invented certain new and useful Improvements 1n Propellers for D shwash ng Machines, of which following is the specification.

The invention relates to improvements in dish washing mach nes and partlcularly to the propelleror dasher and ,the tank bot-;

tom in which the propeller operates, and an object of the invention is to provide a double bladed propeller which will throw the water forcibly upwardly at a high velocity and will distribute the same throughout the area of the tank so that all the dishes within the tank are subjected, on the both faces thereof, to a passingcleansing streamgof Wa er- A further object is to construct a propeller which will throw thewater in a spiralling stream between the dishes, the water striking the top of the. tank and being deflected outwardly and subsequently returning to the bottom of the tank down the side walls thereof.

lVith the above more important objects in view the invention consists essentially in the arrangement and construction of arts hereinafter more particularly descri d, reference being had to the accompanying drawings in which:

Fig. 1 is an interior view of the upper part of the casing, part of the front thereof having been torn away.

Fig. '2 is a plan view of the casing with the cover removed and showing the position of the dishes in the rack.

Fig. 3 is a perspective view of the propeller.

Fig. i is an enlarged detailed vertical secthe I lyis provided with an elevated bottom ,5 wh ch prov des a washing tank-6. The bot-.

tomof the :tankis shallow saucer shaped and presents an outer gradually'inclining rim 7 and a central well 8. lVit-hin the tank the dish washing rack 9 is mounted, such rack supporting the plates 10, in inner, out- Here it will be" er and. intermediate rows.

observed that the plates are in an inclined position with their'upper edges tilted outwardly and that the plates of the various rows are approximately parallel, a comparatively wide space being reserved between the rows of the plates to permit of the free flow of watch, A two bladed propeller 11 is located centrally within the bottom of the tank and operateswithin the W611. and is ca ied by a driving: shaft'12 extending through the bottom of the tank and driven in any suitable mann'en, In this connection I, might remark that the shaft 12 is'usually driven by an electric motor housed within the bottom of the outer-casing. The propeller is preferably acast one audit is provided centrally with. a sleeve orsooket 13. which receivesthe upper end ofJt-heshaft 12, the propeller being fastenedv to the shaft by a pin 14. The blades of the propeller,

two in number, are identically constructed and integrally cast with the sleeve, it being here observed that the, lower edge 15 of each blade is more or less horizontal and that the upper edge 16 is inclined, with the result that the blades are much wider at the centre than at the outer ends. In vertical section each blade is for the greater part of an ogee shape, the curve 17 at the upper edge being long at the centre and gradually shortening at the outer end of the blade where it merges into the vertical part of the body. The curve 18 at the lower edge of each blade is more abrupt than that of the upper edge, but itremains more or less constant throughout the length of the blade. The outer end or tips 19 of the blades are curved gradually forwardly in respect to the direction of rotation of the blades and it will be also observed that the upper inner part of each blade is provided with a more or less V-shaped wing 20 which is slightly inclined to the vertical and is positioned at rig-ht angles to the top'of the blade. The inner ends of the Wings are connected by a centrally positioned web 21. Both the top and bottom edges of the blades are sharpened as indicated at 22 and 23.

The propeller is rotated at a comparatively high speed in a clock-wise direction and the water, which is picked out of the well by the lower edges of the blade wings, is thrown upwardly and passes in parallel streams in the form of spray between the plates. In this connection I might point out that the upper edges of the blades are positioned practically at right angles to the lower edges of the plates in the rack and 011 this account the dishes do not materially stop the flow of water. The up-going water, after having passed between the sets of plates, is deflected outwardly by the cover and returns to the bottom of the tank down the outside wall thereof. This down-goii'ig stream of water washes the rear sides of the outer row of plates. I might say that in actual demonstration 'the up-going water has a spiralling course of travel between the plates and that the down-going water has a slightly spiralling direction of travel.

With this particular type of propeller the ,water is evenly distributed throughout the plate containing area of the tank and it throws the water at a high velocity and accordingly particularly effective in washingthe plates.

The well maintains the greatest volume of water at the point where the blade is operating and the shallow rim 7 feeds the downcoming water to the well.

A drain off pipe 24c leads from the well to the exterior of the tank and is provided at its outer end with a tap or drain cook 25.

What I claim as my invention is:

1. A propeller for dish washing machines comprising a vertically disposed blade presenting a substantially horizontal and forwardly curved lower edge and a rearwardly curved inwardly and upwardly inclined upper edge. 1

2. A propeller for dish washing machines comprising a vertically disposed blade of a varying ogee shape in vertical section, the outer tip of the blade being narrow and the inner parts being relatively wide.

3. In a dish washing machine, a propeller comprising a pair of vertically disposed oppositely extending blades connected at their inner ends, said blades having their lower edges substantially horizontal and their upper edges inclined upwardly and converging towards the centerof t-he machine, the said lower edges of the blades being curved forwardly and the said upper edges thereof curved real-wardly and the outer tips of said blades being curved forwardly.

4:. In a dish washing machine, a two bladed propeller having the blades of an ogee shape in vertical cross-section and both with their lower edges horizontal and their upper edges inclining upwardly and inwardly, the tips of the blades being forwardly hooked and the upper central portions of the blades being connected by a cross web.

5. In a dish washing machine, a two bladed propeller provided centrally with a vertical socket and having the lower edges of the blades contained in the same horizontal plane and the upper edges of the blades inclining inwardly and upwardly, and said blades being of an ogee shape in vertical cross-section and having their outer tips forwardly curved and their upper inner portions connected above the socket by a cross web.

Signed at l/Vinnipeg, this 10th day of July, 1923.

GUY S. CLARKSON. 

